what causes fogs?

Answer 1

it happens when the clouds get tired and need some rest. so they lay down for a while.

no actually it happens when the cool wet air that creates actual clouds in the sky actually occur low to the ground. in some cases if you drive up a mountain you run threw clouds which causes fog in really high altitudes.

Answer 2

STRATUS AND FOGS


Stratus clouds and fogs occur at or near the surface of Earth and can seriously restrict visibility at low levels. Therefore, they are a very important consideration in aircraft operations, particularly in connection with landings and takeoffs. Fogs are especially significant to the pilot who limits his flying to visual flight rules, because ceilings under stratus clouds often are very low, and visibilities in fog conditions often are not sufficient to permit navigation by visual reference. Too, fogs are of great concern to ships. In harbors and over open ocean areas, fogs constitute a definite hazard to safe navigation. For these reasons it is important that you have a basic understanding of the factors leading to the formation and dissipation of stratus and fogs, and the basic types of fog.

Stratus and fogs result from the condensation of excess water vapor out of a saturated air mass. Both are composed of small water droplets or small ice particles suspended in air. The main difference between them is that fog is a layer of suspended droplets adjacent to Earth's surface, while stratus is fog that has been lifted or has formed some distance above the ground. Moisture will not condense out of pure (nuclei-free) air until a high degree of supersaturation (from 400 to 800 percent humidity) is reached. The air within the troposphere is not nuclei-free. Moisture can condense on nuclei when relative humidity reaches approximately 100 percent. (Some nuclei become effective at relative humidities as low as 70 percent, which may produce haze and the beginning stages of fog.) The atmospheric nuclei believed important in the condensation process are sea-salt particles and certain hydroscopic products of combustion. The combustion nuclei are more common over industrial areas, but some condensation nuclei appear to be universally present.

Answer 3

Humidity that evaporates and then with a sudden change of temperature turns back to water

Answer 4

humidity and evaporation

fog is really just clouds that are low to the ground